4 Dall and Bartsch The Pyramidellida?. 



than in Pyramidella and larger than in Odostomia. Type, Turbonilla 

 typica D. & B.= Turbonilla plicatula Risso not Turbo plicatulus Scacchi. 



Odostomia Fleming. 



Shell usually short, few whorled, subconic or ovate; columellar fold 

 single, varying in strength, outer lip entire. Type, Tiirbo plicata Mont. 



Murchisonella Morch. 



Shell minute, cylindro-conic; outer lip with an anal sinus behind the 

 periphery of the whorl; pillar with the plait obsolete or internal, whorls 

 numerous and inflated. Type, Murchisonella spectrum Morch. 



SYNOPSIS OF THE SUBGEXERA OF PYRAMIDELLA. 



A 1 Columellar folds three 

 Shell umbilicated 



Basal fascicle absent, surface polished, marked by extreme 

 ly faint lines of growth and microscopic spiral striations 

 Subg. Pyramidella Lamarck, s. s., 1799. 

 Type, Trochus dolabratus L. 



Basal fasciole present, surface less polished than in Pyramidella 

 s. s., marked by lines of growth and microscopic spiral 

 striations 



Milda subg. nov. 



Type, Obeliscus ventricosus Quoy. 



Shell not umbilicated. 



Surface polished, marked only by fine lines of growth and 

 microscopic spiral striations 

 Periphery sulcate 



Subg. Longchseus Morch, 1875. 



Type, Pyramidella punctata Chem. 



Periphery not sulcate 



Voluspa subg. nov. 



Type, Pyramidella auricoma Dall. 



Surface sculptured 

 Basal cords absent 

 Periphery sulcate 



Shell marked by strong axial ribs which terminate 

 at the periphery, and microscopic spiral striations 

 Subg. Pharcidella Dall, 1889. 



Type, Pharcidella folinii Dall. 



